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Quillon Checkout

Role
Lead front-end engineer
Year
2025
Type
Fintech · Web app
Stack
Next.js, TypeScript, and Edge

A checkout rebuilt from scratch for speed in 14 markets.

The challenge

Every extra second of loading cost conversions, especially on mid-range Android phones.

What I did

Streamed server rendering, moved risk checks to the edge and cut the client bundle to 92 KB.

Results

1.3sp75 LCP, down from 3.1 s
+11%Checkout conversion
92kBJavaScript, gzipped